The Pointillist chooses a means of expression by which he applies colour on a canvas in small dots rather than spreading it flat. - Paul Signac

..it [the large painting 'Bathers at Asnieres', by Georges Seurat was painted in great flat strokes, brushed one over the other, fed by a palette composed, like Delacroix's, of pure and earthy colors. By means of these ochres and browns the picture is deadened, and appears less brilliant than those the impressionists paint with a palette limited to prismatic colors. But the understanding of the laws of contrast, the methodical separation of elements — light, shade, local color, and the interaction of colors — and their proper balance and proportion, give this canvas its perfect harmony.

It seems that the first consideration of a painter who stands before the white canvas should be to decide what curves and arabesques should cut the surface, what tints and tones should cover it.. .Following the precepts of Delacroix he would not begin a composition until he had first determined its organization. Guided by tradition and by science, he would adjust the composition to his conception, that is to say he would adapt the lines (directions and angles), the chiaroscuro (tones), the colors (tints), to the traits he wished to make dominant.

Divisionism is a complex system of harmony, an aesthetic rather than a technique.
The point is only a means.
To divide is to seek the power and harmony of color, through representing colored light by pure elements, and through employing the optical mixture of these pure elements, separated and proportioned according to the essential laws of contrast and graduation.